Typescript rewrite

.eslintrc.js

@@ -0,0 +1,33 @@
+const OFF = 0;
+const WARN = 1;
+const ERROR = 2;
+
+module.exports = {
+  parser: '@typescript-eslint/parser',
+  plugins: ['@typescript-eslint', 'prettier'],
+  extends: ['plugin:@typescript-eslint/recommended', 'plugin:prettier/recommended'],
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: 'module',
+  },
+  rules: {
+    '@typescript-eslint/no-non-null-assertion': OFF,
+    '@typescript-eslint/no-empty-function': OFF,
+    '@typescript-eslint/ban-ts-comment': WARN,
+    '@typescript-eslint/ban-types': OFF,
+    '@typescript-eslint/no-explicit-any': OFF,
+    '@typescript-eslint/explicit-module-boundary-types': OFF,
+    '@typescript-eslint/no-object-literal-type-assertion': OFF,
+    'no-console': [ERROR],
+    '@typescript-eslint/no-unused-vars': [ERROR, { argsIgnorePattern: '^_' }],
+  },
+  overrides: [
+    {
+      files: ['*.test.ts', '*.test.tsx'],
+      rules: {
+        // Allow testing runtime errors to suppress TS errors
+        '@typescript-eslint/ban-ts-comment': OFF,
+      },
+    },
+  ],
+};

.husky/pre-commit

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+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+# npm test

.prettierrc

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+{
+  "singleQuote": true,
+  "printWidth": 100,
+  "tabWidth": 2,
+  "trailingComma": "all"
+}

jest.config.ts

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+import type { Config } from "@jest/types";
+
+const setup: Config.InitialOptions = {
+  collectCoverage: true,
+  collectCoverageFrom: ["**/*.{ts,tsx}"],
+  coveragePathIgnorePatterns: [
+    "/node_modules/",
+    "/dist/",
+    "jest.config.ts",
+    "index.ts",
+  ],
+  coverageThreshold: {
+    global: {
+      functions: 80,
+      lines: 80,
+      statements: 80,
+    },
+  },
+  preset: "ts-jest",
+  testEnvironment: "node",
+  testMatch: ["**/__tests__/**/*.{ts,tsx}"],
+  testTimeout: 10000,
+};
+
+export default setup;